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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43f1e1d3a3d7cf719b4fa90287c492e83c2d2cee2ddd9e253f691f3da61a0c7d' 
  AND token = 'd2UaQIUnOeRJIJCIXyjhrh1CkbmM/0K9iE5iPZnjXyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}